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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



  history
ID: 428738.0, Fritz-Haber-Institut / Physical Chemistry
Reversible isomerization of an azobenzene derivative adsorbed on Au(111): Analysis using vibrational spectroscopy
Authors:Óvári, László; Schwarz, Jutta; Peters, Maike V.; Hecht, Stefan; Wolf, Martin; Tegeder, Petra
Language:English
Date of Publication (YYYY-MM-DD):2008-05-03
Title of Journal:International Journal of Mass Spectrometry
Journal Abbrev.:Int. J. Mass Spectrom.
Volume:277
Issue / Number:1-3
Start Page:223
End Page:228
Copyright:© 2008 Elsevier B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:High resolution electron energy loss spectroscopy (HREELS) is employed to analyze reversible changes in the geometrical structure of the molecular switch di-methoxy- tetra-tert-butyl-azobenzene (diM-TBA) adsorbed on Au(111), which are induced by UV-light and thermal activation. While for one monolayer (ML) coverage no changes in the vibrational structure due to UV-light exposure at 3.5 eV are observed, illumination of 2 ML of diM-TBA leads to a pronounced modication of the vibrational spectra, which we assign to a trans → cis isomerization. The reverse process, i.e., the cis → trans isomerization, can be stimulated by thermal activation.We propose that the photoisomerization is driven by a direct (intramolecular) electronic excitation of the adsorbed diM-TBA molecules in the second ML analogous to diM-TBA in the liquid phase.
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Óvári L, Wolf M, Tegeder P (tegeder@physik.fu-berlin.de), Freie Univ Berlin, FB Physik, Arnimallee 14, 14195 Berlin, Germany; Peters MV, Hecht S, Humboldt Univ, Dept Chem, Brook-Taylor-Str 2, D-12489 Berlin, Germany; Óvári L, Current address: Chem Res Center HAS, Reaction Kinetics Res Lab, Szeged, Hungary
Identifiers:URL:http://www.sciencedirect.com/science?_ob=ArticleUR...
DOI:10.1016/j.ijms.2008.04.024
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